Definitions of the area and density grades of superficial punctate keratopathy
| Area (total sum of the affected area) | |
| A0: | no punctate staining |
| A1: | the area occupies less than one third of the cornea |
| A2: | the area occupies one third to two thirds of the cornea |
| A3: | the area occupies more than two thirds of the cornea |
| Density | |
| D0: | no punctate staining |
| D1: | sparse density |
| D2: | moderate density |
| D3: | high density and lesions overlap |